import matplotlib.pyplot as plt
import numpy as np

# ypoints = np.array([1, 3, 4, 5, 8, 9, 6, 1, 3, 4, 5, 2, 4])
# plt.plot(ypoints, marker='o')
# plt.show()

ypoints = np.array([6, 2, 13, 10])
plt.plot(ypoints, 'o:r')
plt.show()
